CONDITIONALS

ZERO CONDITIONAL

If you don’t water flowers, they die.

If you have a headache, stop watching TV.

With zero conditional

we express a general truth or we give advice.

If clause:

PRESENT SIMPLE

Main clause:

PRESENT SIMPLE

or [ IMPERATIVE ]

FIRST CONDITIONAL

If the weather is nice, we will go for a walk.

If you don’t apologize, she will never trust you again.

The first conditional refers to the present and future.

It expresses a possible condition and

its probable result in the future.

If clause:

PRESENT SIMPLE

Main clause:

FUTURE WILL

If I had a lot of money, I would buy a big house.

If I knew his number, I would phone him.

if-clause:

PAST TENSE SIMPLE

main clause:

WOULD + INFINITIVE

SECOND CONDITIONAL

The second conditional refers to the present and future.

It expresses an unreal situation and its probable result.

The situation or condition is improbable, impossible,

imaginary, or contrary to known facts.

If I WERE you...

FIRST v. SECOND CONDITIONAL

THE DIFFERENCE: FIRST and SECOND CONDITIONAL

Both conditionals refer to the present and future.

The difference is about probability, not time.

First conditional: real and possible situations

Second conditional: unlikely to happen

If John runs fast, he will win the race.

If John ran fast, he would win the race.

This is still possible to happen.

This is unlikely to happen because John doesn’t run fast.

THIRD CONDITIONAL

If I had had a lot of money, I would have bought a big house.

If I had known his number, I would have phoned him.

if-clause:

PAST PERFECT SIMPLE

main clause:

WOULD + HAVE + PAST PARTICIPLE

The third conditional refers to the past and

it is not based on facts. It expresses the a situation

which is contrary to reality in the past.

SECOND v. THIRD CONDITIONAL

THE DIFFERENCE: SECOND and THIRD CONDITIONAL

The difference is about time.

Second conditional: refers to the present and future

Third conditional: refers to the past situations

If I saw a car accident, I would call an ambulance.

If I had seen a car accident, I would have called an ambulance.

But I don’t see an accident now. This is unlikely to happen.

But I didn’t see an accident yesterday. This is contrary to the fact in the past.

ALL CONDITIONALS

0. If he drives carefully, he avoids the accident.

General time reference.

1. If he drives carefully, he will avoid the accident tomorrow.

This is still possible to happen.

2. If he drove carefully, he would avoid the accident today.

But he doesn’t drive carefully. This is unlikely to happen.

3. If he had driven carefully, he would have avoided the accident yesterday.

But he didn’t drive carefully, so he didn’t avoid the accident.